CN104244525B - A kind of LED drive system with linearity light adjusting function - Google Patents
A kind of LED drive system with linearity light adjusting function Download PDFInfo
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- CN104244525B CN104244525B CN201410466614.9A CN201410466614A CN104244525B CN 104244525 B CN104244525 B CN 104244525B CN 201410466614 A CN201410466614 A CN 201410466614A CN 104244525 B CN104244525 B CN 104244525B
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Abstract
The invention discloses a kind of LED drive system with linearity light adjusting function, it is characterized in that: by driving chip U1, output circuit (5), current rectifying and wave filtering circuit (1), the protection circuit (2) being connected with current rectifying and wave filtering circuit (1) outfan, with the amplifying circuit (3) that protection circuit (2) outfan is connected, the adjustment circuit (4) being connected with amplifying circuit (3) outfan forms; The outfan regulating circuit (4) is connected with driving chip U1, and the input of output circuit (5) is connected with driving chip U1. LED can be carried out linearity light adjusting by the present invention, and when light modulation, LED does not have flicker, does not interfere with the visual effect of people, LED lamp self is also had protective effect simultaneously.
Description
Technical field
The present invention relates to a kind of LED drive circuit, specifically refer to a kind of LED drive circuit with linearity light adjusting function.
Background technology
Electric consumption on lighting consumption now accounts for the 20% of whole power consumption, and reducing electric consumption on lighting is the important channel saving the energy, and for realizing this target, more efficient, reliable, safe, the durable new type light source of development and application is imperative. LED is because of the advantages such as its high brightness, low in calories, long-life, nontoxic, recyclable recycling, the green illumination light source that 21 century of being known as is the most promising, in the middle of being widely used in people's life at present and having produced.
In life, the LED luminance required for different occasions is different, and people pass through the brightness adjusting LED to meet the needs of various occasion. But the dimming control switch sold currently on the market is usually nonlinear, when regulating, LED can glimmer, with also affecting LED service life when affecting people's sight line.
Summary of the invention
Present invention aim at solving prior art LED when regulating LED luminance and there will be flicker, with the defect also affecting LED service life when affecting people's sight line, it is provided that a kind of LED drive circuit with linearity light adjusting function.
The purpose of the present invention is achieved through the following technical solutions: a kind of LED drive system with linearity light adjusting function; by driving chip U1; output circuit; current rectifying and wave filtering circuit; the protection circuit being connected with rectification filter circuit output end; with the amplifying circuit that protection circuit output end is connected, the adjustment circuit being connected with amplification circuit output end forms. The outfan of described adjustment circuit is connected with driving chip U1, and the input of output circuit is connected with driving chip U1.
Described adjustment circuit is made up of potentiometer R10, resistance R9, electric capacity C4. The fixing end of the one of potentiometer R10 is connected with amplifying circuit and output circuit after resistance R9 simultaneously, fixing end is connected with the LD pin of driving chip U1, adjustable side is connected with the LD pin of driving chip U1 for another, and one end of electric capacity C4 is connected with driving chip LD pin, the other end is connected with the junction point of resistance R9 and amplifying circuit.
Further, described current rectifying and wave filtering circuit is made up of fuse FU, diode bridge rectifier U, electric capacity C1. One end of fuse FU is connected with an input of diode bridge rectifier U; electric capacity C1 is serially connected with between two outfans of diode bridge rectifier U; the two ends of electric capacity C1 are also connected with protection circuit, and another input of the other end of described fuse FU and diode bridge rectifier U forms current input terminal.
Described protection circuit includes audion VT1; the resistance R1 that one end is connected with the negative pole of electric capacity C1, the other end is connected with the base stage of audion VT1 after resistance R3; the resistance R2 that one end ground connection, the other end are connected with the junction point of resistance R3 and resistance R1; with the resistance R1 electric capacity C2 being in parallel; the resistance R4 that one end is connected with the positive pole of electric capacity C1, the other end is connected with the colelctor electrode of audion VT1; be serially connected with the resistance R5 between the collector and emitter of audion VT1, and with the resistance R5 electric capacity C3 being in parallel. The grounded emitter of described audion VT1, the negative pole of electric capacity C3 is connected with amplifying circuit, and the junction point of resistance R4 and electric capacity C1 is connected with amplifying circuit.
Described amplifying circuit is made up of resistance R6, amplifier PA1, resistance R7, audion VT2, resistance R8. The positive pole of amplifier PA1 after resistance R6 simultaneously with the positive pole of electric capacity C1 and the colelctor electrode of audion VT2 is connected, negative pole is connected with the negative pole of electric capacity C3 after resistance R7, outfan is connected with the base stage of audion VT2, the emitter stage of audion VT2 is connected with the junction point of resistance R9 and electric capacity C4 after resistance R8, colelctor electrode is connected with output circuit.
Described output circuit is by field effect transistor MOS, N pole VIN pin with driving chip U1 after resistance R11 is connected, the diode D1 that P pole is connected with field effect transistor MOS drain electrode, N pole is connected with field effect transistor MOS source electrode, the diode D2 that P pole is connected with the junction point of electric capacity C4 and resistance R9, one end is connected with the VIN pin of driving chip U1, the electric capacity C5 that the other end is connected with the P pole of diode D2, one end is connected with the RT pin of driving chip U1, the resistance R12 that the other end is connected with the P pole of diode D2, and form with the diode D1 electric capacity C6 being in parallel. the N pole of described diode D1 is also connected with the colelctor electrode of audion VT2, and the grid of field effect transistor MOS is connected with the GATE pin of driving chip U1, source electrode is connected with the CS pin of driving chip U1, and the two ends of electric capacity C6 are simultaneously also as current output terminal.
The present invention compared with the prior art, has the following advantages and beneficial effect:
1, the present invention is compared with Conventional LED circuit, the light uniform and smooth when adjusting brightness of LED lamps, and flicker free, shake, the visual effect making people is better.
2, the present invention can linear regulation LED brightness, make LED self unaffected when regulating brightness, extend LED lamp service life.
3, present configuration is simple, it is simple to operation.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of the present invention.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment
As shown in Figure 1; the kind of the present invention has the LED drive system of linearity light adjusting function; by driving chip U1; output circuit 5; current rectifying and wave filtering circuit 1; the protection circuit 2 being connected with current rectifying and wave filtering circuit 1 outfan, with the amplifying circuit 3 that protection circuit 2 outfan is connected, the adjustment circuit 4 being connected with amplifying circuit 3 outfan forms.The outfan of described adjustment circuit 4 is connected with driving chip U1, and the input of output circuit 5 is connected with driving chip U1.
In order to realize dimming function, thus being provided with adjustment circuit 4, described adjustment circuit 4 is made up of potentiometer R10, resistance R9, electric capacity C4. The fixing end of the one of potentiometer R10 is connected with amplifying circuit 3 and output circuit 5 after resistance R9 simultaneously, fixing end is connected with the LD pin of driving chip U1, adjustable side is connected with the LD pin of driving chip U1 for another, and one end of electric capacity C4 is connected with driving chip LD pin, the other end is connected with the junction point of resistance R9 and amplifying circuit 3. Adjustable side by regulator potentiometer R10, it is possible to achieve the linearity light adjusting of LED.
Unidirectional current in order to civil power being become smooth-going uses for subsequent conditioning circuit, thus being provided with current rectifying and wave filtering circuit. Described current rectifying and wave filtering circuit 1 is made up of fuse FU, diode bridge rectifier U, electric capacity C1. One end of fuse FU is connected with an input of diode bridge rectifier U; electric capacity C1 is serially connected with between two outfans of diode bridge rectifier U; the two ends of electric capacity C1 are also connected with protection circuit 2, and another input of the other end of described fuse FU and diode bridge rectifier U forms current input terminal. When civil power obtains stable unidirectional current after current rectifying and wave filtering circuit 1.
Operationally, circuit there will be short-circuit conditions unavoidably, in order to protect LED when short circuit without damage thus design have protection circuit 2. Described protection circuit 2 includes resistance R2, resistance R1, electric capacity C2, resistance R3, audion VT1, resistance R4, resistance R5, electric capacity C3. The base stage of audion VT1 is connected with positive pole and the amplifying circuit 3 of electric capacity C1 after resistance R4 through resistance R3 ground connection, colelctor electrode after resistance R2 simultaneously, grounded emitter. Resistance R5 is serially connected with between colelctor electrode and the emitter stage of audion VT1. Electric capacity C3 and resistance R5 is in parallel, and a common end is connected with amplifying circuit 3. One end of resistance R1 is connected with the negative pole of electric capacity C1, the other end is connected with the junction point of resistance R3 and resistance R2. Electric capacity C2 and resistance R1 is in parallel. Protect circuit 2 normal operation when whole circuit is normal, when a short circuit occurs, output voltage is sampled through R1 and R2, and the magnitude of voltage obtained is unable to maintain that audion VT1 turns on, and then VT1 turns off, and circuit quits work.
Described amplifying circuit 3 is by processing electric current, to obtain required size of current. It is by amplifier PA1, audion VT2, the resistance R6 that one end is connected with the positive pole of amplifier PA1, the other end is connected with the positive pole of electric capacity C1 and the colelctor electrode of audion VT2 simultaneously, the resistance R7 that one end is connected with the negative pole of amplifier PA1, the other end is connected with the negative pole of electric capacity C3, and the resistance R8 composition that one end is connected with the emitter stage of audion VT2, the other end is connected with the junction point of resistance R9 and electric capacity C4. The colelctor electrode of described audion VT2 is also connected with output circuit 5.
Described output circuit 5 is by field effect transistor MOS, N pole VIN pin with driving chip U1 after resistance R11 is connected, the diode D1 that P pole is connected with field effect transistor MOS drain electrode, N pole is connected with field effect transistor MOS source electrode, the diode D2 that P pole is connected with the junction point of electric capacity C4 and resistance R9, one end is connected with the VIN pin of driving chip U1, the electric capacity C5 that the other end is connected with the P pole of diode D2, one end is connected with the RT pin of driving chip U1, the resistance R12 that the other end is connected with the P pole of diode D2, and form with the diode D1 electric capacity C6 being in parallel,The N pole of described diode D1 is also connected with the colelctor electrode of audion VT2, and the grid of field effect transistor MOS is connected with the GATE pin of driving chip U1, source electrode is connected with the CS pin of driving chip U1, and the two ends of electric capacity C6 are simultaneously also as current output terminal. The GND pin ground connection of described driving chip U1.
During work, civil power carries out rectification and Filtering Processing through current rectifying and wave filtering circuit 1, thus obtaining stable unidirectional current. Carry to terminal from the unidirectional current of current rectifying and wave filtering circuit 1 output through overprotection circuit 2; when short circuit occurs in circuit, resistance R2 and resistance R1 in protection circuit 2 sample, and the magnitude of voltage obtained is unable to maintain that audion VT1 turns on; then VT1 turns off, and the circuit LED that quits work is protected. Circuit is not short-circuited, and protection circuit 2 is then powered to amplifying circuit 3. Electric current size of current required for accomplished LED operation after amplifying circuit 3 processes exports to regulating circuit 4 again. Electric current is powered to LED again through output circuit 5 after being processed by driving chip U1 thus lightening LED lamp. When people need the brightness adjusting LED, it is possible to the adjustable side of regulator potentiometer R10 is to change the resistance of potentiometer R10, thus realizing the linearity light adjusting of LED.
As it has been described above, just can well implement the present invention.
Claims (2)
1. a LED drive system with linearity light adjusting function, it is characterized in that: by driving chip U1, output circuit (5), current rectifying and wave filtering circuit (1), the protection circuit (2) being connected with current rectifying and wave filtering circuit (1) outfan, the amplifying circuit (3) being connected with protection circuit (2) outfan, and adjustment circuit (4) composition being connected with amplifying circuit (3) outfan; The outfan regulating circuit (4) is connected with driving chip U1, and the input of output circuit (5) is connected with driving chip U1;
Described adjustment circuit (4) is made up of potentiometer R10, resistance R9, electric capacity C4; The fixing end of the one of potentiometer R10 is connected with amplifying circuit (3) and output circuit (5) after resistance R9 simultaneously, fixing end is connected with the LD pin of driving chip U1, adjustable side is connected with the LD pin of driving chip U1 for another, and one end of electric capacity C4 is connected with driving chip LD pin, the other end is connected with the junction point of resistance R9 and amplifying circuit (3);
Described current rectifying and wave filtering circuit (1) is made up of fuse FU, diode bridge rectifier U, electric capacity C1; One end of fuse FU is connected with an input of diode bridge rectifier U, electric capacity C1 is serially connected with between two outfans of diode bridge rectifier U, the two ends of electric capacity C1 are also connected with protection circuit (2), and another input of the other end of described fuse FU and diode bridge rectifier U forms current input terminal;
Described protection circuit (2) includes audion VT1, the resistance R1 that one end is connected with the negative pole of electric capacity C1, the other end is connected with the base stage of audion VT1 after resistance R3, the resistance R2 that one end ground connection, the other end are connected with the junction point of resistance R3 and resistance R1, with the resistance R1 electric capacity C2 being in parallel, the resistance R4 that one end is connected with the positive pole of electric capacity C1, the other end is connected with the colelctor electrode of audion VT1, be serially connected with the resistance R5 between the collector and emitter of audion VT1, and with the resistance R5 electric capacity C3 being in parallel; The grounded emitter of described audion VT1, the negative pole of electric capacity C3 is connected with amplifying circuit (3), and the junction point of resistance R4 and electric capacity C1 is connected with amplifying circuit (3);
Described amplifying circuit (3) is made up of resistance R6, amplifier PA1, resistance R7, audion VT2, resistance R8; The positive pole of amplifier PA1 after resistance R6 simultaneously with the positive pole of electric capacity C1 and the colelctor electrode of audion VT2 is connected, negative pole is connected with the negative pole of electric capacity C3 after resistance R7, outfan is connected with the base stage of audion VT2, the emitter stage of audion VT2 is connected with the junction point of resistance R9 and electric capacity C4 after resistance R8, colelctor electrode is connected with output circuit (5).
2. a kind of LED drive system with linearity light adjusting function according to claim 1, it is characterized in that: described output circuit (5) is by field effect transistor MOS, N pole VIN pin with driving chip U1 after resistance R11 is connected, the diode D1 that P pole is connected with field effect transistor MOS drain electrode, N pole is connected with field effect transistor MOS source electrode, the diode D2 that P pole is connected with the junction point of electric capacity C4 and resistance R9, one end is connected with the VIN pin of driving chip U1, the electric capacity C5 that the other end is connected with the P pole of diode D2, one end is connected with the RT pin of driving chip U1, the resistance R12 that the other end is connected with the P pole of diode D2, and form with the diode D1 electric capacity C6 being in parallel, the N pole of described diode D1 is also connected with the colelctor electrode of audion VT2, and the grid of field effect transistor MOS is connected with the GATE pin of driving chip U1, source electrode is connected with the CS pin of driving chip U1, and the two ends of electric capacity C6 are simultaneously also as current output terminal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410466614.9A CN104244525B (en) | 2014-09-12 | 2014-09-12 | A kind of LED drive system with linearity light adjusting function |
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| CN201410466614.9A CN104244525B (en) | 2014-09-12 | 2014-09-12 | A kind of LED drive system with linearity light adjusting function |
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| CN104244525A CN104244525A (en) | 2014-12-24 |
| CN104244525B true CN104244525B (en) | 2016-06-08 |
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| CN201410466614.9A Expired - Fee Related CN104244525B (en) | 2014-09-12 | 2014-09-12 | A kind of LED drive system with linearity light adjusting function |
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| CN105376892A (en) * | 2015-12-11 | 2016-03-02 | 成都翰道科技有限公司 | Intelligent LED lamp control system based on adjustable constant-current drive circuit |
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| WO2012061999A1 (en) * | 2010-11-12 | 2012-05-18 | Shan C Sun | Reactance led (light-emitting diode) lighting current control scheme |
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| CN201113523Y (en) * | 2007-10-24 | 2008-09-10 | Bcd半导体制造有限公司 | Direct-current input -type charger |
| CN101541116B (en) * | 2008-03-19 | 2012-10-31 | 淄博诺达网络科技有限公司 | Electronic ballast of alternate current high-power LED illumination energy-saving lamp |
| CN102711309A (en) * | 2011-03-28 | 2012-10-03 | 海洋王照明科技股份有限公司 | LED (Light Emitting Diode) driving circuit and lamp |
| US20130088170A1 (en) * | 2011-10-06 | 2013-04-11 | Excelliance Mos Corporation | Driving circuit of light emitting diode and light source apparatus |
| CN103491664A (en) * | 2012-06-12 | 2014-01-01 | 硕颉科技股份有限公司 | Load actuating device and method for light emitting diode lamp and lighting device with light emitting diode lamp |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012061999A1 (en) * | 2010-11-12 | 2012-05-18 | Shan C Sun | Reactance led (light-emitting diode) lighting current control scheme |
| CN202197443U (en) * | 2011-09-22 | 2012-04-18 | 宿州市博远新能源电子科技有限公司 | LED (Light-Emitting Diode) street lamp driving power supply |
| CN203504821U (en) * | 2013-09-17 | 2014-03-26 | 宁波市江北天瑞电器有限公司 | Light adjustment type LED constant current driving power supply |
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Inventor after: Zhao Guo Inventor after: Kang Yuling Inventor after: Ren Shibo Inventor after: Chen Wei Inventor after: Huang Xianfeng Inventor after: Xie Hongjun Inventor after: Lin Jing Inventor after: Wang Yue Inventor after: Liu Ting Inventor after: He Dong Inventor after: Zhang Chenghao Inventor before: Zhou Xiaoling |
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Effective date of registration: 20160516 Address after: 274100, Shandong, Heze province Dingtao County Binhe office, west section of the road Applicant after: Dingtao County Power Supply Company, State Grid Shandong Electric Power Company Address before: 610000 Chengdu City, Jinjiang District Province, east of the main street on the spring section of No. 1, No. 229, building 6, No. 603 Applicant before: Chengdu Weibang Science And Technology Co., Ltd. |
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